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The configuration options include >> parameters like frequency, channel, and IO mode. The new IOCTL command >> allow users to dynamically configure the eSPI controller and slave. > > Why? We have spidev... There is no support from the slave device side to register as an SPI slave device with the SPI framework and provide SPI communication. For this reason, the AMD eSPI driver can only handle device initialization itself and provide a character device file as an interface to user space.